Portable lamp



FIG. 1 is a side view of an portable lamp showing my new design;

FIG. 2 is a another side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a rear view. 

The ornamental design for a portable lamp, as shown and described. 